US3617192A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crosslinking of cellulosic materials with products produced by the reaction of alkyl sulfonamides and formaldehyde under alkaline conditions
Assignee: COTTON PRODUCERS INST
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Filing: 1965-11-22
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Granted: 1971-11-02
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Expires: 1985-11-22
Abstract
Abstract Formaldehyde is reacted with alkyl sulfonamides under alkaline conditions. The resulting products are useful modification agents for cellulosic fibers.
Inventors
- 👤 Ronald Swidler
- 👤 Clifford M Moran
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:43
CPC Classifications
D; D06; D06M; D06M15/00; D06M15/19; D06M15/37; D06M15/63
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
12 words
A process according to claim 1 wherein said sulfonamide is methane sulfonamide.
Claim 2
Dependent Claim
12 words
A process according to claim 1 wherein the sulfonamide is ethane sulfonamide.
References Cited (Backward Citations)
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FR751641A
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US2002613A
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GB470519A
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FR812073A
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FR823925A
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US2160196A
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US2184279A
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US2207803A
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US2448125A
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US2373299A
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FR1082885A
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GB842802A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-01 | 1975-05-03 | 1975-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-01 | 1979-05-03 | 1979-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-01 | 1983-05-03 | 1983-11-02 | $7700.00 | Window Closed / Lapsed |